Police officers stand in position by the 911 Hair Salon as they watch demonstrators protest the shooting death of teenager Michael Brown on Saturday, in Ferguson, Missouri. Missouri Governor Jay Nixon and Missouri State Highway Patrol Captain Ronald Johnson imposed a 12 a.m. curfew for demonstrators continuing to protest the death of Brown, who was shot last week by Ferguson Police Officer Darren Wilson.

A woman under an umbrella walks past police officers standing in position as they watch demonstrators protest the shooting of Michael Brown on Aug. 16 in Ferguson, Mo. JOSHUA LOTT / AFP - Getty Images